3.
    发明专利
    未知

    公开(公告)号:BR7805546A

    公开(公告)日:1979-04-10

    申请号:BR7805546

    申请日:1978-08-25

    Applicant: HOECHST AG

    Abstract: A synthetic resin binder comprising an aqueous mixture of phenolic resins and optionally other additives wherein the mixture of phenolic resins comprises (I) at least one phenol-resol and (II) at least one co-condensate of at least one monohydric phenol and at least one polyhydric phenol with formaldehyde and wherein in component (II) the molar ratio of the quantities of formaldehyde used to the sum of phenols is within the range of from 0.6:1 to 1.5:1, a method for the manufacture of an abrasive by means of said synthetic resin binder and the abrasives itself.

    4.
    发明专利
    未知

    公开(公告)号:BR7808388A

    公开(公告)日:1979-08-07

    申请号:BR7808388

    申请日:1978-12-21

    Applicant: HOECHST AG

    Abstract: An adhesive binding agent based on at least one polymer of dicyclopentadiene and at least one aromatic hydrocarbon wherein the polymer comprises from 40 to 80% by weight of cyclopentadiene units and from 20 to 60% by weight of at least one aromatic hydrocarbon having a boiling point in the range from 110 DEG to 220 DEG C., selected from the group consisting of alkylaromatic hydrocarbons and tetrahydronaphthalene, said polymers having a mean molecular weight of from 300 to 5000, an iodine number (measured according to DIN Standard 53241, part 2) of from 0 to 60, and a melting point in the range of from 30 DEG to 150 DEG C., and an adhesive containing said binding agent in combination with a rubber or an ethylene-vinylacetate copolymer.

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